Old 02-01-19, 01:45 PM
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Andrew R Stewart 
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Drop can be about pedal strike, fit (bar/seat heights) and stability. But that last one can be different then you might think. I'm no engineer but here's a situation that taller is more stable. Try balancing a tall/long stick on your hand (it was a base ball bat when we were kids). Don't let it fall. Now do the same for a short stick and see how much harder it is to keep balanced. The taller item starts to fall over at a slower rate and therefore is easier to react to and correct for.

I would follow Richard Sachs's advice and not change the drop from your standard road amount. The tire growth will raise the BB somewhat any way. Andy
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